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International Journal of Steel Structures

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14-09-2022

Failure Criteria of Cellular Steel Beams Under Ambient and Elevated Temperature

Authors: Vijaya K. Kotapati, Ashish P. Khatri

Published in: International Journal of Steel Structures | Issue 5/2022

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Abstract

The fire resistance time of a member plays a significant role in structural fire safety. The determination of FR time for cellular steel beam is quite complicated because of irregular geometry due to the presence of web openings. Hence, the present numerical study intends to provide the upper bound FR time of CBs with effect of governing load determined either from shear or flexure criteria. The finite element models are first validated against a set of beam tests and numerical data from literature by performing structural, thermal, and thermo-mechanical analyses of solid as well as CBs. The developed FE model is used to perform parametric studies to further investigate the structural response of CBs in a standard fire. The various parameters considered in the present study are the size and spacing of the opening, various span to depth ratios of beams, and web slenderness. In all the numerical analyses, CBs are analyzed with a uniformly distributed load and having simply supported boundary conditions. The FR time of CB is evaluated based on the three failure criterias viz. shear, flexure, and deflection. The study shows that the web slenderness with size and spacing of the opening influences governing failure mechanism at elevated temperatures.

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Title: Failure Criteria of Cellular Steel Beams Under Ambient and Elevated Temperature
Authors: Vijaya K. Kotapati
Ashish P. Khatri
Publication date: 14-09-2022
Publisher: Korean Society of Steel Construction
Published in: International Journal of Steel Structures / Issue 5/2022
Print ISSN: 1598-2351
Electronic ISSN: 2093-6311
DOI: https://doi.org/10.1007/s13296-022-00664-5

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